When is the best time to observe Delta Hydrae?

Delta Hydrae is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is Delta Hydrae located in the sky?

Delta Hydrae lies in the constellation Hydre at right ascension 08h 38m and declination +05° 42′.

What telescope do I need to split Delta Hydrae?

Splitting Delta Hydrae requires an aperture of roughly 520 mm or larger — the components are separated by about 2.7″ at magnitudes near 4.2. The companion is about 6.5 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Delta Hydrae — Étoile Double dans Hydre

Magnitude 4.2^m DoubleStar Hydre (Hya) Visible

Carte du Ciel + Liste + Plan

Observer

1Propriétés Physiques

Magnitude 4.16

Type Spectral A1Vnn

Couleur de l'Étoile Blanc (B-V 0.00)

Distance 99 ly

2Position et Identifiants

RA 08h 37m 39.4s

Dec +05° 42' 13.0"

Constellation Hydre (Hya)

HR 3410

HIP 42313

HD 73262

SAO 116965

Bayer Delta

Flamsteed 4 Hya

SIMBAD

3Facilité de séparation

Principale 4.2 mag Compagnon 10.7 mag Séparation 2.7″

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Télescope	Bortle 3	Bortle 4	Bortle 5
Réfracteur 80 mm Réfr. 80mm	T. diff.	T. diff.	T. diff.
Newton 150 mm Newt. 150mm	T. diff.	T. diff.	T. diff.
Celestron C8 (SCT 203 mm) C8 203mm	T. diff.+	T. diff.+	T. diff.+